I would call and talk to your dr. I haven't felt suicidal while on wellbutrin really. It might be more situational for you. You haven't been on wellbutrin long and you said it was a low dose (which is how I started also). I would just be honest with your dr...so you can get some answers.
Sorry about what you are going through. We are here for you...please let us know how you are doing and what the dr has to say. Take care...
Jane