Burning Pain under arms

Recently had a sinus infection, started Echinacea and goldenseal 2 tabs 3x a day. Started menstruating cylce, went surfing for 3 1/2 hours and woke up the next morning with sever burning and pain under right arm near breast, along back side and under upper arm. Next day spread to left armpit, under arm as well. But no swelling or lumps, just burning pain to the touch. Its been 5 days, burning is more less intense, but still localized to my left and right armpits and pectorals.
Please help, can't find any info on why? I'm thinking its from my sinus infection spreading through my lymph nodes?Did the echinacea put my immune system into overdrive? Is that even possible? Stopped the echinacea on day 1 of pain - went to the doctor on day 3, prescribed antibiotics and I am 3 days into dosage without change of pain.
How long should this pain last----wanna surf again :(  And is a lymphatic drain massage a good idea? My sister is a certified massage therapist and wants to help - but I don't know if thats what I need.

[Maxy_pharma]

that may be illness associated with menstruation which may be exaggerated by specific factor,  keep on antibiotic (wide scale coverage like Augmentin ) take some pain killer (paracetamol is effective and safe)  some vitamins or tonics may be useful (i recommend primose oil containing product)
good luck