Sometimes this pain prevents me from walking

Hello.
i have recently been told that i may have reactive arthritus. I did have one episode of diorreahh three weeks ago for one day only, fully recovering the following day. two weeks later i started having stiffness in my joints, mainly my right elbow, acheing in my right eye, right little finger, ankle, but, stabbing pain in left hip/groin which has slowly improved but is still active. Sometimes this pain prevents me from walking properly. i am really frightened i have something terrible going on, as i also have a health anxiety, even though my symptoms are very real. My doctor has asked me to return in four days time to follow up on how things are going, rather than writing me off with arthritus. i am 41.