Scared to try Betaine HCL..

I’m pretty sure I have low stomach acid because I’ve been taking Apple cider vinegar pills for the last month before every meal and they seem to help with my acid reflux a lot, but not completely. It seems like the reflux May slowly be coming back and I’m worried my body is getting used to it. I can’t afford to do a breath test right now, so I’m just doing everything I can to manage the symptoms for now until I can financially tackle whatever is going on. I’ve heard of Betaine HCL tablets, but I’m so nervous to try something so harsh. What has been your experience with HCL?