Wasp sting is so itchy- nothing's helping?

That sounds like it's really uncomfortable.

To start off, make sure that you've cleaned the area with soap and water. You can try putting an ice pack wrapped in a cloth on the area (alternating 15 minutes on and off). That should help some with the swelling, redness, and itching.

As far as medications go, there are a lot of different products available to help relieve the itching from bug bites. You may want to check with your pharmacist to make sure what you select won't interact with your medication. When you select a product, you should look at the active ingredients, since that will tell you what the product can do. Hydrocortisone is a popular ingredient that can help to reduce itching, redness, and swelling. Some of the antihistamines are available as creams, which can also give some anti-allergy effect. Other ingredients may include analgesics or anesthetics (these provide pain relief) and skin protectants. If you haven't already tried Hydrocortisone, that would be a good place to start. A 1% hydrocortisone could be applied to the bite three times a day.

It is really important to try to avoid scratching at the bite, since broken skin can lead to infection. If the redness or swelling starts to spread, if pus appears, or if the bite doesn't start to look better over the next couple of days, you should contact a doctor so they can take a look at it.