I don't know why you would need physics as a premed prereq; I would think that you would be taking chemistry classes instead.

I'm afraid I don't have any advice I can offer, as I was in engineering and had no problems with physics. The thing that helped the most was watching example problems get worked out, but I'm a visual learner...

I had a number of classes that I didn't like; I just had to keep working problems over and over.

I hope you make it through with your sanity intact.