Obsessive Compulsive Disorder

[laneyx25x]

Hi all
I was diagnosed with anxiety and panic disorder 2 years ago I was taking 20mg of citalopram for 2 years but im now off my medication for the past 4 months its seemed to do the trick for the panic attacks as they are less intense and I can get on with my daily activities work, socialising, shopping, etc
But now im having extreme bouts of obbessive worrying that lasts weeks on end and really gets me depressed I think I may have ocd as one thing in particular that is on my mind for the past few weeks is...when I was travelling home on the bus from work an old man sat down in the seat right beside me and took out a book and as I glanced down I saw that his hand was slightly on my left leg I waited for a few moments thinkin he would realise he was touching my leg and remove his hand but he didn't so I shifted my leg and banged my bag lightly on his hand and he then removed his hand and immediately got off the bus. so then the rest of the evening I didn't think any thing of it, until that night in bed I started to get a fear and irrational thoughts that maybe he stabbed me with something like a syringe and that I would get aids and I do have an extreme fear of catching this disease, I keep thinking and worrying about this over and over until im sick with worry I know the thoughts are irrational and that I would have seen a syringe in the man's hand, would have felt it if he had stabbed me, and it would have left a mark on my leg even my boyfriend checked my legs and said trust him im just being silly but I can't stop worrying!! Are these symptoms of ocd? if I had of been stabbed it would have left a big sore mark right?