Risk/warnings for heart or anything else for taking short term Hydroxyzine HCL 25mg for health related anxiety? Only as needed, how long can I take?

Potential. The FDA has recently issued warning on the potential cardiovascular side effects from hydroxyzine. If you have no cardiac problem and a normal EKG, I think the risk is very very low. But if you do have a history of cardiovascular disease especially with a rhythm disorder, best to check with your doctor first.