<human>: Can you summarize the given text in a few sentences?

Sorry for the poor title... I honestly don't know what I should have made it.

Around seven months ago I injured my left knee while running Track and Field (I do 400's/800's) for my College. The best way to describe it is whenever I run I feel a lot of pain behind my left knee and when If I put my hand on it I can almost feel like a tendon is "pushed out". While I was originally optimistic about my recovery... well... it hasn't been going so well. 

I've been through two physical therapists and the doctor I've seen already was useless (walked in, took an x-ray, said he didn't know what was wrong and left in less than 10 minutes). All of them had different ideas on what was wrong- whether it was a baker's cyst, tendonitis or an issue with my Gastrocnemius behind the knee (which I believe is the correct one.) I've been doing all the recommended stretching and running exercises given to me since late July/August and while they've helped somewhat I still feel like I haven't made much progress and I'm currently dealing with scar tissue that somehow appeared in my left calf. 

I can start jogging again which is great... but I need to roll out heavily and do stretching afterwards. For sprinting though it's just a straight up no and I will still feel pain during the night or when laying down in bed even If I only did stretching for the day.

My friends and family have been concerned as well as to how long this is taking, which, needless to say is starting to scare me as well. my season also starts in a few weeks and I just don't know what to do. I'm going to be seeing another doctor in a week and was going to go over the idea of a Cortisone injection (never had one before.) The reason I'm posting though is If anyone has had any experience with this type of injury or problem and can offer advice or help to help ease my mind. I would be really appreciative.
<bot>: Pain in tendon behind left knee, been 7 months, not much progress- now dealing with scar tissue, and I'm scared and unsure what to do.