I'm 36 Years Old And I've Been Going To The

I'm 36 years old and I've been going to the bathroom once or twice a day, usually diarrhea or really loose, and the toilet is filled with red blood. I've also passed blood clots every time and notice what looks like mucous a few times. I started a diet on 11/2/16 and since that time, have lost 38 lbs! I don't know if my diet has anything to do with it and I've been scared to bring it up to my Dr. Any advice?