Somehow i tend to get a feeling that my memory has gone down after having ocd. does ocd bring down memory?

OCD: Possible, since it is an anxiety disorder. Also, effect of medications is another possibility over time. Consult your doc.

Yes it can.: Studies show deficits in non-verbal & visual memory in people with obsessive compulsive disorder which is likely due to how memory is encoded with ocd and subsequent difficulty with retrieval. There is no evidence to suggest that memory that is verbally stored is deficient with ocd.