Hi Tara fasts! Yeah Jake has opened up a WHOLE CAN OF PROMISING WORMS for many of us! HCL is hydrochloric acid (which is naturally produced by our stomachs - so it's not another 'gimmick' pill)
Many brands do different types - DEREK is right, I would go for Betaine Hydrochloride and pepsin (If you can). Look for a pill with about 500mg+ hydrochloride per pill - otherwise you will be taking far too many pills with each meal!
I have just ordered Thorne's Betaine hydrochloride 520mg + pepsin 20mg (which was recommended to me by someone else) because they sell jars of 225 and 625 and have a good reputation!
I'm also going to ask my doc tommorrow if this available on prescription (I doubt it) as I don't know how long it will take to return my stomach to 'normal'
Anyway, good luck on your road back to health (:0])