PredniSONE and dizzy spells

I'm 26 years old and broke out in a horrible rash back in June. It was basically all over my upper torso, arms and my legs. I went to see a dermatologist and got a high prescription of Prednisone (40mg/day). The rashes went away, but I had many side effects. I gained 10 pounds in a few months (and it's hard for me to gain weight due to my high metabolism), my cholesterol shot up from 170 to 219, I was having mood-swings and feeling depressed, I was having dizzy spells, and it seemed like I was eating everything in sight. Now that I am off Prednisone, my cholesterol is back to normal and am not feeling depressed or having mood-swings. I am still waiting and working on losing the extra weight which does not seem to go away, esp. around my stomach area. I still feel light-headed at times but it's bearable. I hope there is a better drug or solution out there in case of another break-out. I do not want to go through that again.

I have been on prednesone for six days, for recurring virtego, my ENT Doctor prescribed 2 tablets of prednesone twice a day for five days and then tapering off at 2 tablets twice a day for five days and then 1 tablet once day for five days. I'm at the sixth day with 1 tablet of prednesone and my body is all swell up and shakey. I'm unrinating more often than usual. I feel alot better. My dizzy spells were very bad and headaches are gone. I'm not sure whether to keep taking the prednesone as prescribed--my ENT Doctor doesn't know about my side affects yet.

I've been on 90mg of prednisone for about a month and a half for nephrotic syndrome and have had some of the more common side effects like the round face, some weight gain, dizzy spells, and some others.

I started to feel better after about 3 weeks on the drug then I started to get a weakness in my legs almost to the point that I can't support my own body. I know that prednisone causes muscle weakness but this seems excessive. I have to keep myself from falling nearly every time I try to walk, even short distances. My doctors are looking into it just to make sure it's not something else but I think it's the drug.
Has anyone else had this problem and does it get any better? As far as my blood work goes, I'm not dehydrated and my potassium levels are fine so we know that is not the problem.

Also, I'm starting to have some heart problems. Before the prednisone my resting heart rate was in the 60's now it's in the upper 90's and even goes up into the 100-120's. And if I even walk to the bathroom it goes into the 150's. And my blood pressure is extremely high. Anyone else dealt with this. It's worrying me and my primary doc seems really worried about it but my kidney specialist just wants me to wait it out and stay on the high dose as long as I can.

I'm at the point where my kindey specialist says if I go off the prednisone it could lead to kidney failure but my primary doc says that if I stay on such a high dose I'm at risk for a heart attack.