Jug symptoms and conditions

I was given prednisone for the second time this year having never taken it.
1st time was for an allergic reaction to sulfa,
thought I was having a heart attack a couple of hours after it kicked in.
(I am 28)
Lost so much strength, used to go out & do 10-15 chin-ups, couldn't get to 1.
Grouchy, weepy.
That was in August.
I November (1 week before thanksgiving) I got sick with upper respiratory, same cold as rest of my family, but it knocked me out. Doctor figured it was cause of the 5-8 cigarettes i smoked at the time,
prescribed antibiotic.
Flash to 2 weeks before Christmas:
Laying on couch, unable to breath, went to doc, given antibiotic, inhaler, and Prednisone:
2 pills 2x's a day for 1st three days, then 2 pills 1x a day next three days.
I think they where 20 mg?
I was in very bad shape,
But NOW
I had tried to give up those last few cigarettes I had held on to, since I had gotten so sick.
I had insomnia, nausia, insatiable appetite, sweating, fuzzy upper lip ( i am female)
gained 15 pounds, depression, couldn't even shower unless I dragged myself through it, quit quitting smoking to try to alleviate the depression, but this is unlike anything I have ever felt.
Oh, and the reason I am up so late,
my right thigh feels like it is dying from the inside out.
It started the day after starting the meds, that was December 21st. It is now January 3, and it won't stop. I am so worn out from it.
I can't sleep.
It's like a cramp that never ever ends, but it's down in the bone.
My 3 yr old daughter put her weight against it and I screamed.
It seems like it is walnut sized, with pain radiating out from it.
I thought I might have a blood clot, my husband brought me Aspirin tonight in bed, and now I just cannot sleep,
it doesn't just hurt, it is hurting to distraction.
I feel out of my mind,
and so old.
My stomach had been solid abs a few months ago, I worked so hard on them, now, I do not have the strength to lift a jug of milk, and my tummy looks more like pizza dough.
I am 5'6" and went from 118 lbs to 135, right now back down to 127 as I cannot eat even though I am starving, I just can't.
But I am really scared about this leg pain.
I swear there is something in there, and at night I fear it coming loose in my sleep and killing me. Mind you, I am not sitting here imagining it, i am feeling this pain in what little sleep I am getting, and the dreams start.
I was on it a short time, but it was 2 times this year, within 6 months, do you guys think it is the reason?
any thing you think would help. Thanks