Where is the pain in your right foot? Heel pain?? Just want to clarify because when I hear "posterior tibial nerve", I'm thinking medial plantar nerve (branch of the tibial nerve) but just want to make sure i'm not assuming things here...

Before I respond I'm going to offer a "disclaimer" to help explain where I'm coming from.....
I started using this forum to discuss specific cases with other physios and totally avoided the "Patient Corner" except to have just a quick read to see if there was anything really interesting including what kind of responses were coming from other physios. The main reason I avoided it, was because other than basic info, I don't feel comfortable giving specific answers when I can't actually assess that client in person. Also, I don't like second guessing the professionals that the client has actually seen. I needed to tell you this so you know why my response may seem a little "fluffy".....

What I'm saying is that I don't want to second guess your podiatrist because he actually assessed your foot and has seen the progression since first getting your orthotics etc.

So, can a branch of the tibial nerve be irritated with foot injuries, changes in footwear etc. - YES.
Should you stop wearing your orthotics - NOT NECESSARILY. The nerve COULD be mildly irritated from biomechanical changes from the orthotics or a change in gait. I really wouldn't think that the nerve would be irritated MORE by the orthotics however it's really hard to say from here what irritated it in the first place and what to change to get the pressure off that nerve.

Basically, what I'm saying is trust the person that has been working with you (your podiatrist). BUT if your gut is saying, "this doesn't make sense" (based on your symptoms, the sequence of events etc.) then ask him to explain more thoroughly what you should do to make your rehab a little smoother (because that right foot is going to influence the left and your success and compliance with the orthotics). I can't imagine there are many health care professionals out there (physios or podiatrists or whatever) that wouldn't get it if you said, "Holy crap! I'm going to be chasing bats in a forest in Poland soon and I need to know what to do!!". (i.e. I can't imagine he's going to think you're over-anxious for asking questions...so ask questions.) If that doesn't work, have an assessment of your situation by a physiotherapist (again). If you do that, just make sure you let them know everything that you have already done and that your other foot has flared with some past physiotherapy treatment.

Whew!! That was a long-winded answer!! What I'm trying to say is that the physios that access this forum can all help to a certain extent because of our training and interest in the puzzle that is the human body. And although we can assess injuries to an extent via a computer, it's not as good as seeing you in person!!

Sorry...don't know if that helped at all....