What should I do?

My shoulder down to my hands pain is been 2 weeks already. Though I'm at rest, I can still feel the pain, mostly on my left arm. Sometimes I can feel the pain near in my armpit. And accompanied by mild lightheadedness that's for 2 weeks as well. I really don't what to do.

The first thing to do is see your doctor to put your mind at ease.

Been to doctor a lot but they can’t find anything. I was just given a PPI medication.

Hi Anna
PPI medication come with side effects too. I have read posts where people have aches and pains such as you describe. Some PPIs cause vit B12 deficiency which could be causing your pain. I’m not a doctor but I think it would be worth speaking to your doctor about it even if it means taking a B12 supplement, but CHECK with him first. I was prescribed omeprazole once but after reading the side effects decided not to take it.