There isn’t really an exercise that specifically targets chest fat—you generally need overall fat loss. Cardio like swimming plus strength training (push-ups, presses, etc.) can help. If you think finasteride may be contributing to breast enlargement, it’s worth discussing that with your doctor too.
I’d start by checking whether the supplier has verifiable business details, clear wholesale terms and genuine customer reviews. I’d also place a small test order first rather than committing to a large quantity. It’s worth checking minimum order quantities, shipping times and return policies too.
A month of headaches is worth getting checked rather than just taking painkillers every day. Frequent use can actually cause medication-overuse headaches. If you can’t get a GP appointment sooner, try NHS 111 for advice, especially if the headaches are worsening or unusual for you.