Clomipramine might be your first choice:
"Clomipramine is used to treat obsessive compulsive disorder (OCD). It helps decrease persistent/unwanted thoughts (obsessions), and it helps reduce the urge to perform repeated tasks (compulsions such as hand-washing, counting, checking) that interfere with daily living."
Several studies say Wellbutrin (bupropion) is not effective for the treatment of OCD and it doesn't get rave reviews for anxiety disorders in general.
"Lamotrigine is a commonly used drug in the treatment of bipolar depression, and there are occasional reports of its use in the management of OCD. Our case series suggests that lamotrigine use may be associated with first-onset of OCD in some patients with bipolar disorder."
Unfortunately, most if not all, psychotropic medications have the potential to cause side effects especially during the initial period of treatment as the metabolism adjusts to the drug and stabilizes.
Just a thought... are you in therapy? CBT (cognitive behavioural therapy) has been shown to be very effective in treating OCD.
That all being said I hope it may help you find the right solution. OCD is very difficult to treat but it can be managed quite successfully in many cases.