Nope Joseph it is not the UT taking you down but the Hydrocortisone.
Do not continue the HYD.
How long you been on them... no wonder you have weak adrenals.
I had weak adr. for a while.. I had to take hyd. to get through some bad stress. so I took them for 4=5 months and cratered... went off them and took Seriphos for a while...
There is a Dr. Rhodes in Oregon... whom you can call and get testing and help from - do call him - you cannot know what is wrong with the adrenals hi or lo until you test... he can get your through that.