Psychological disturbance symptoms and conditions

I have read the posts below and thank goodness I found this site! I got an injection on Wednesday, 6/17, in my right knee and for the first 24 hours it hurt like heck - more stiff and painful than prior to the injection. On Friday I woke up shaky and started to feel anxious. My face and chest flushed a bright red which lasted all day. Saturday was worse; shaky, heart racing or palpitating, head/neck pressure with headache, hot flashes, nausea and stomach cramping/pain. I even actually had a panic attack (already a predisposition for me). I became uncontrollably weepy and depressed! Today, Sunday, I STILL have major anxiety and headache/pressure. I'm convinced the injection brought all of this on because before this, all I had was knee pain. So, WHEN will these icky symptoms start to subside? I was told the cortisone was good for 4-6 months. I can't live feeling like this everyday for that long!!! Any suggestions or encouragement?