There is alot going on at the moment and i think according to the information given by you all is in going in favour of Acute Urticaria(Angioedema
If you have any of the problems like,
facial or lip sewlling
tummy pain and upsets
then you shoukd seek urgent help in the emergency unit
so that they can evaluate and give you certain medications for that,because it shouldnt be left untreated.
Once the acute phase is over and treated well then you can fix an appointment with your dermatologist
and he can proceed further.
i hope the information will help you.
All the best.