Bite causing body pain ?

I really don't know what to do next. 2 weeks ago, my daughter had an unusually bad case of croup. She has not had croup since she was 4 (she's 9 now), but even after the 3rd day on prednisolone, her throat closed again, ER gave her decadron and even on that her throat continued to close up..she lost her voice for 10 days and was listless on the couch (Christmas mind you)...she never ran a fever more than 98.8...when she finally was off the couch she complained of a very itchy bite of some sort, we've had issues with Brown recluses (I was bit just 4 months ago) so immediately I thought it was a spider bite, but it was just a raised bump on her knee that itched her a lot...it never turned red around the site...a day after the bump and 5 days since then she's had constant recurring "dull-sharp" pain as she calls it...the worst was the fleshy part on the side of her hand, she said it felt like bee stings that wouldn't stop..she was crying and holding her hand and it was bright red...all the other pains happen for about 3-10 seconds and will hit at her jaw, her thigh, her calf, her toe, her finger, her head, her neck, the back of her arm, she'll complain that her legs feel like they're going to break and she's too weak to stand, but when we went for to the doctor, he did the neurological strength tests on her and she was fine, no weakness....he did a full CBC and sed rate, all came back normal...she continues to have these pains, probably 30-40 times a day..they're not specifically at joint locations or muscle..she says they feel like they're inside the body not on top of the skin...it's becoming a nuisance for her and the weakness when it hits will just put her on the floor..those happen less infrequently about once or twice a day...could the virus that attacked her throat have crossed into her nervous system? Or could all this be related to the bite on her knee? Is there anything else I should be looking for? She has dark circles under her eyes and her coloring just doesn't look as healthy as she usually is...not sure if it's just impact of the bad virus or this stuff...any ideas?