Well it's reasonable o be concerned about a family member. But if extreme anxiety is a recurring issue, maybe you should get a prescription. If you have a similar situation in the future, think about it this way: if something bad had happened to them, you would have gotten word already.

Not exactly. If someone dies or goes missing over seas, it can take months or even years to get so much as a notification, let alone answers. Hell, my basically-grandfather on my mom's side died three months ago and I didn't find out until I walked into my mom's room four days ago and found her crying over the fact no one told us. (Granted, I was more angry no one told her than really upset about it, for reasons, but the point stands.) Considering the anxiety was caused by a specific trigger, medication would really only have masked the anxiety and symptoms until the trigger was resolved. Which, in this case, would mean hearing back from the cousin. Just drugging OP would be the equivalent of spraying air freshener in a room with a pile of shit in it- it doesn't remove the problem. It's also possible that OP did use medication, but the anxiety was worse than the medication could treat. In both cases, OP probably should have gone to the hospital or at least their doctor, since long term panic attacks can cause health issues. The cousin was also kind d a dick for not replying.