Hi
I work with people all the time who have Hip issues. Most of the time they dont even realize it. Sore shoulders, neck, knees etc etc. Most of the time, the issue comes down to Hip problems.
You need to work on the issues around the hip 1st, the foot last!
Im not surprised at all you did a hammie whilst wearing orthodontics!
Its hard via forum, but ill give you some basics
1st - get flexibility in major muscles - Hammies, thighs, hip flexors, lower back, glutes.
2nd - Learn to foam roll. There used to an excellant article on the net, its gone or moved. But google it i guess, and search the forums. Or youtube might be the best bet.
3rd - See a top Massage specialist to check for Scare Tissue in Hammie and Hips and get it removed
4th - See somebody who specializes in Posture (not a chiro) To make sure your on the right track and re-commence your running once they give you the all clear.
I fixed a lady who for 12yrs was seeing all sorts of specialists (physio, osteopaths, chiro etc etc) and she still got bed ridden after a hard days work. Even after 12 yrs. 6wks With me, she had her 1st wk Pain free and has been getting better and better since.
Learn to squat proper
learn to lunge proper