Welcome, GCS310!
Your first 2 days of being on Lamictal were awesome --cool! My experience was that the first 2-3 days I was fatigued with body aches (like hit by a truck, lol) and a mild headache. But it passed.

You say you're worried that if you call your doctor, he will attribute it all to the anxiety (or put you on another med). It's an important caveat to acknowledge that we don't actually KNOW what he would say.

But let's say he does chalk it up to anxiety. That wouldn't seem entirely unreasonable to me. I don't say that to be judge-y or anything (I've got GAD with my bipolar), I say it because it all sounds very much like my BF (AKA Mr. Anxiety ). Second-guessing the meds, self-adjusting (a bit of this to balance that), going off things, taking different dosages than prescribed, very impatient, feeling riding out side effects is intolerable, etc..

He totally does these things, and gets frustrated. But often he really isn't doing what he's supposed to be, because he's busy with his own version of "doctoring". He just can't let go of the control, and his decisions are driven by constant self-monitoring and anxiety, which can also lead to psychosomatic reactions (which can make a viscious anxiety circle).
This might not apply to you, but it does seem worth considering that anxiety might be playing a bigger role than might seem apparent.

I hope the Lamictal works out for you. It's too early to say though. By all means, don't be afraid to contact him if you think you should. Perhaps he can suggest something for the itchiness (even if it were a med, it would probably be a short-term one to get you past this). Good luck!