Been having allergic hives from 2017. .not sure... How it has developed. But I had by mistake drunk expired green not sure if it caused the prob. Till now have figured few things why hives appear but not all so it keeps recurring. I was put on antihistamines it dint work. I m asked to take montec lc.. It gives relief for two days but a very drowsy tablet. Any solution. Apart from this tab what can I take.. I feel this urticaria has caused anxiety disorder in me because of its recurrence whenever where ever what ever time. It's really upsetting.. But living with it as I have a kid.. Is it. COntagious. Thanks