Four months ago - you're right to stay away from relationships right now, I think. I think it would be a good idea for you to get thine ass to that therapist (as long as you find the right one and think it would be helpful for you).

In general I would expect this kind of thing to impact more than just romantic relationships. I'd encourage you to seek help as soon as possible, because this may be impacting you in ways you don't or won't even realize until much later. I don't know how old you are, and I see you're a guy, but I know that adolescent and pre-pubescent girls who experience sexual assault are significantly more likely to develop eating disorders after the event(s) for instance - it's often posited that these girls "want to disappear" or are striving to return to pre-pubescent states (when assault occurs after puberty). This probably doesn't appear directly relevant, but I wanted to provide examples of long-term effects from sexual assault that one wouldn't be able to predict or anticipate immediately after such an event.

I'm sorry for what happened to you, and it sucks.