Red, sore inflamed rashes on abdomen - Has anyone else had this?

Hi am new to this group, I just really would love some advice!

so 3 days ago I came out in a few red itchy blotches on my lower belly, I’ve had this before but not as bad as now (currently waiting for a 111 nurse call as I can’t walk) it’s spreaded onto my upper thighs and my face and neck and arms, on my lower belly were I have a few stretch marks from my children well they have become so lumpy and really sore to touch, I get tiny little shocks all over my itchy parts, it’s unbearable, I can hardly walk anywhere as my thighs kill when I move.. also on the sore parts it’s red hot to touch. There like patches! I don’t no what to do!! I do have eczema and have since been a baby but this is something I have never had this bad, i haven’t had anything I don’t normally have, I have no creams so I’ve been applying Vaseline to help the dryness from it, also been taking 4 Benadryl a day to help as it’s unbearable & it does a Teeny bit help the burning and shock sensations!! Has anyone got any advice 😭