<nods> Agreed with Rual. If antibiotics, then it is some sort of infection, not just inflammation, where perhaps corticosteroids might be injected or oral NSAIDs prescribed.
I've had tennis elbow from repetitive stress, and I just (re)tore my right bicep a couple weeks ago, so those are both injury related. Can't quite square antibiotics with anything similar. Could they be anti-inflammatories instead, Matt?
Sure sorry you're not feeling top-notch, Matt, and even worse if it is painful. Healing thoughts your way for recovery soonest!
All the best,
Dan.