This patient support community is for discussions relating to undiagnosed symptoms, breathing difficulties, feeling cold, cough, diarrhea, dizziness, fainting, fever, indigestion, itching, nausea, numbness, pain (chronic), paralysis, rash, sweating, swelling, urination problems, and vomiting.
If the headaches continue to bother you, either while you are lifting or not, you should see your doctor. When you lift weights you increase the pressure in your chest, abdomen, and head. This pressure change can cause damage if the change is too great or too sudden. The safest thing is to see your doctor and not self-diagnose.
I'm not sure there's over the counter muscle relaxants, I live in the US and there's no over the counter muscle relaxants but I would recomment Soma.
Go to your doctor and if theres an over the counter muscle relaxant try it, it wouldn't hurt.
take care