A few days ago I took a fall going down hill after hitting a large pothole. I fell on my right side, which if you didn't know is the side that contains the chain and gears on most bikes. Looking at my bike today, I noticed that when spinning the pedal the chain on the crankset makes contact with the shifter at a certain point in the rotation in both 3rd and second gear. furthermore when running the pedals in reverse the chain seems to slip at a certain spot.
So here's the question. I am having trouble identify the problem with my bike, I originally believed that it may be a bent crankset but due to the problem affecting multiple gears on my bike I am not sure that that is the case. The only other possible cause of the problem in my mind is a bent bottom bracket or frame and am hoping that you guys could walk me through identifying the problem and repairing it if possible.