First of all, that sounds so painful!
And aaaah yes, I remember getting prescribed various creams and having them work for a number of days and then I'd slide even further downhill than I was before. It also took my doctors doing biopsies to rule a bunch of stuff out. I never had them suggest a steroid injection, though. The doctors did put me on Prednisone which I hated. It made me feel really puffy and Prednisone has an awful reputation for side effects including psychotic episodes. The doctors were all, "are you SURE you don't want to take this anymore...?". I definitely did not.
The patch test you did sounds just like the one I went through. I'm wondering why you're still reacting though... Things that pop into my head are:
- Perhaps you have other allergies you aren't aware of?
- Are you using some products or eating something with PG hidden inside it? (If you're sensitive enough, your skin can break out by eating something you're allergic to and PG is hidden in very common food ingredients such as modified food starch.)
- When your skin reacts to an allergy, it's called "allergic contact dermatitis" which is a form of eczema. People can have more than one type of eczema (a doctor I went to thinks I'm atopic as well)... This is definitely something to think about. These are the different types of eczema.
My biggest piece of advice would be to reduce the amount of products you're using (hair,body,cleaning,etc) as much as you can.... anything that touches your skin. The less you're exposed to at this point, the better. Investigate the ingredients and take into consideration that there could be chemicals hidden inside those ingredients. Do the same thing with food, drinks and vitamins. If it doesn't have an ingredient label (like on perfume), stay away from it. Look for trends as far as which ingredients are most common in your products and see if you can figure out which product you're allergic to.
Make sure to also talk about this with your doctor. Perhaps there are some other chemicals they can test you for. I'm not sure what you do for a living, but pay attention to the stuff you're touching on a daily basis and where your skin is reacting. This can be very helpful when it comes to figuring out what the culprit is.
I hope this helps! It's a lot to take in and the beginning of this sort of journey can be really overwhelming... make sure you're taking lots of "you" time, relaxing and staying hydrated!