Sorry for the delayed reply. Melissa has some good points - could be a nerve issue. I’m not an expert in that area, but when I do hear about pain in the high upper hamstring, the first thing I think about is overstriding. This could be due to a tight hip flexor (inhibiting the opening of the hips as your leg swings back) or other issues you have going on that area. The bunion points to overpronation and while mild support may help, another root could be up in your glute medius - a common area for a lot of runners to be weak in. Plus, you’re female, so we already have more relaxation in that area.
Rather thank think of the pelvis tilting, think of stabilizing the pelvic area. Go through the postural alignment steps, and pay attention to keeping a tall spine -which will help in the next step - stabilizing the pelvis. Rather than sucking your gut in and trying to flatten your back, try this: stand straight and tall (shoulders over hips!!), keeping your feet ‘glued to the ground’, lean slightly forward from your ankles til you feel some engagement in the low abs. That’s what you want to feel as far as engaging the pelvis - holding it stable so your hips don’t rock up and down and you don’t bend at the waist.
Lastly (really firstly) - check your feet alignment! Make sure as you lift the heel, you are coming up evenly through the front - ball of the foot behind the big toe, and behind the little toe.
If there is an instructor in your area, make an appointment with them. Much has change (principles are the same) in how we approach the posture etc. You can also download the Chi Running app (for iPhone; Android soon) and get some good lessons from there. Go here: http://www.chirunning.com/m/app Chi-W.alk Run is awesome for getting your mojo back - check it out too! http://www.chirunning.com/learn-it/chi-walk-run.
Keep us posted!
Certified Chi Running and Chi Walking Master Instructor