I am getting rash outbursts once daily. they are very itchy and goes away after short while. quicker if i drink allergex. can this be related to stres?

Possibly : Rashes can happen for many reasons... stress, pressure, cold, etc, are not as common, but are possible. Itchiness suggests a histamine reaction, so antihistamines may help. If you’ve identified stress as a potential cause, you will want to try to eliminate stress as much as possible (sometimes easier said than done). Consider yoga/walks/tai chi. Consider decreasing caffeine/sugar-inflammatory food