NYC,
I'd give it a little while longer, your symptoms aren't risky.
The DANGEROUS allergic symptoms to look for are lip, eyelid, and tongue swelling or any problem breathing or hives...then stop IMMEDIATELY.
The long term side effect that gets many people off this class of drugs is an endless tickly cough that starts after a couple weeks on the drug and lasts until you stop taking it. If that happens then you usually have no choice.
If you can take an ACE inhibitor, it is a good, effective (at least for a year,) cheap class of drugs.