Michvetinfla, the psych diagnosis won't help your case at this time. The case is your feet, and then spinal degeneration. I know that it has created mental issues for you, but filing psychological issues like depression without first having a service connected disability is going to kill your case outright. The VA looks at "kitchen sink" cases and then backburners them like my 10-year fight to get my own issue dealt with. It's going to be tough to pull this together, but I would start with your feet.
First, ask your Dad if he knows any chiropractors in the area that can give you an examination and look at your x-rays and the military evidence and see what they think. Believe me, having a friendly chiropractor that has a current license is going to be half the battle.
You see, many of the chiropractors in our area are seeing patients forwarded to them by the VA. The chiropractors are the ones doing spinal and skeletal issue DBQs for the VA. And if they are doing those forms for the VA, they have zero interest in doing one directly for you even if you pay them to do the same exam. Why? Because they are on the VA payroll by virtue of having a steady stream of referrals and don't want to tick off the VA. And now with the DBQs gone, you need an exam from a competent outside doc that can give you an equivalent to a C&P exam examination. I haven't been able to find one yet in my area, though I did get a physical therapist to finally give me a spinal ROM and am combining that with a spine surgeon's report.
Second, that examination has to be equivalent to a VA C&P exam. You need the DBQ exam without the DBQ. Or use the DBQ form anyway. I'm including the one for Foot Conditions (21-0960M-6), but it may take me a bit more to find 21-0960M-5 which is the Pes Planus one.
Then, you'll need nexus to connect the service injuries to your current injuries. This needs to be done by a podiatrist or a chiropractor or someone with specialty in spines or feet and skeletal conditions. The VA wants the exams to be done by someone in person, but the nexus can be a reviewer that takes your records and looks at them. That reviewer needs to be a specialist that I mentioned above, or the VA will simply toss it.
Your Dad can put his discussion of your case in a short letter that you submit. As he does not have his medical license now, he can't be your medical exam or nexus. But he CAN be Lay Evidence and submit a buddy letter on your behalf. The fact that he was a licensed chiropractor should have some weight.
Get the feet done first, then go after the spinal degeneration. If you try to go after feet, knees, hips, spine, psychological damage and all the rest, the VA will just trash it and it will be hard to get a C&P.
Now, you were military, get your records from the National Records Center, both military and medical, then apply for Veteran Health Benefits. You qualify with at least a day in Active Duty service. Ask for an appointment. Get the VA doc to examine your feet. That may get the ball rolling alone. VHA (the Health group) and VBA (the Benefits group) are not the same and the VA docs are often human.
Last piece of advice in this message: send the forms in on paper to the VA Evidence Intake Center as certified mail, return receipt requested. That decreases the "lost records". Keep copies of every paper you send them AND those mailing receipts. When they send you stuff, keep the paperwork and their envelope. Twice now I've had to prove an effective date based off the letter and envelope the VA sent me and my mailing receipts by taking pics and sending my rebuttal in with these pics.
They will still deny you the first time and basically want you to get a VSO immediately. I've never had one, and I did win my first 30% on my own (PTSD, which is really difficult to do and moreso because it was non-combat and I'm female). It takes years to get through this system. Years. Every denial or setback takes another 3-4 year waiting period. If they think you are one of the "file everything and I'm faking it" crowd, they'll wait you to death. I'm at the point where I realize that I can't go further without a lawyer or advocate. And I'm close. Really really close.
VBA-21 - Foot conditions DBQ form.pdf