Small bumps spreading on body? Doctor says its heat rash or allergies? It's been 6 days. Very itchy. Wrong diagnosis?

Allergies or hives. You need re-evaluation by your doctor or dermatologist. Hives (urticaria) is a form of allergic reaction with welts that come and go (increased on skin folds/creases, or after scratching). Many other causes of itchy rash - such as scabies (intense itching, starts in one place and spreads, small bumps + scratch marks, it spreads to others), drug reaction, food allergy, liver disease,... etc.
Check in again. TIme to let your doctor know that the problem is 1. not going away and 2. getting worse/spreading/bigger.

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