Shitty Elbow

Here’s my problem. I have a terrible right elbow that limits me in nearly every exercise that involves elbow extension against resistance, so my upper body movements are very limited. I originally thought it was just tendonitis, so I rested it used wobenzyme and incoporated eccentric exercise and every other thing that has been mentioned for tendonitis. My elbow pain if anything is now worse. I’m fearfull I have some degenerative conditon in my joint, as I always feel rubbing and catching sensations that are often painful. The bad part is I’m still in my early 20’s. Does anyone have any special elbow conditions other than tendonitis that they wouldn’t mind sharing with me. I’m desperate to figure out what my problem might be, and I can’t afford health insurance right now, therefore I haven’t been able to see a doctor. Thanks.