Advice for a suspected case of tibialis posterior tendinosis

I've been suffering from medial ankle pain for about 2 to 3 months (since early May). I initially though it was a grade I deltoid ligament sprain (in both ankles) because the pain was delayed and pretty minor. The pain came a few hours after performing lower body exercises (squats, lunges, single-leg balancing) while trying to force my feet into a neutral position, because I am an overpronator. It responded well to ice and compression at first, and after 3 weeks the pain had subsided. I was walking normally and going up and down stairs as if I was never injured, and about 2 weeks later, the pain returned. What also aggravated it probably were the exercises that I attempted to do to rehab it (single leg balancing and directional movements with theraband resistance). I think I was too aggressive with the exercises. Heat and ice both assist in pain management, but now walking will just bring pain back immediately. I have no visible signs of inflammation - no swelling or heat - and stretching seems to help for the short-term. Exercise also isn't that bad (theraband directional movements and calf raises with the knees bent) but a bit after some discomfort will arise. About a week or two ago, I found out that the pain had to be from either my tibialis posterior or another muscle in the shin/ankle (the flexor hallucis longus? I'm not sure) Since the pain usually comes about with standing and walking, and the fact that I overpronate, led me to believe it is more likely my tibialis posterior, since this has a direct link over overpronating and such