Thanks for your question on Health Care Magic.
I can understand your son's situation and problem.
No need to worry much for
chest pain because it's already 2 months.
Tick bite rarely cause cardiac damage and it is immediate after the bite.
He is having chest pain after 2 months of bite, so chest pain is unlikely due to tick bite.
But better to get done ecg and 2d echo to rule out heart damage.
If both these are normal than no need to worry heart damage.
His chest pain is mostly due to muscular cause.
Swelling and itching at bite site is due to inflammation. So he needs anti inflammatory and anti
histamine drugs.
Don't worry, he will be alright.
Hope I have solved your query. I will be happy to help you further. Wishing good health to your son. Thanks.