Welcome to these forums!
I'm sorry to hear that you've been recently diagnosed with scleroderma and I can understand your concern and worry over the disease and the medication you're taking.
Fortunately (or unfortunately, depending on your point of view) I can give you some first hand advice regarding prednisolone. Firstly, I'll give you the link to our medical page on Glucocorticoids, Steroids (Prednisone) Warnings for Scleroderma as they can produce serious problems when used for treating the disease. Having said that, I have been taking them for the last seven years and when I first started on 10mgs per day, I thought they were nothing short of a miracle drug. I felt so much better than I had for a long time and they had such a euphoric effect on me I felt as if I was swinging off the chandeliers on them. I rather smugly pooh-poohed the known side effects, having decided that they would not affect me and thought that I could stay on them ad infinitum, with no problems - Ha!!
Seven years on and I've experienced almost every known side effect (apart from the renal crisis, which I hope will be indefinitely postponed) and I am very much less ecstatic about them than I was! I've put on weight, my skin is now very thin and injures and tears like tissue paper, but the very worse effect is that I've developed avascular necrosis, which has affected my hips and necessitated my having two total hip replacements. I'm now trying to reduce the steroids, which I did along with my imunnosuppressant prior to my last hip surgery, but unfortunately this resulted in my lung involvement having a flare, so I've had to continue taking 2mgs per day. I shall be trying to reduce them again, as I don't want avascular necrosis in any more joints (I'm rapidly running out of bits to replace!)
I must admit that I haven't noticed feeling hot or flu-like as a side effect of prednisolone and would suggest that if it persists and you're feeling concerned, then you should go back to your consultant and ask his advice. We do recommend that our members, if possible, consult a listed scleroderma expert, as this complex disease does require specialist knowledge and expertise in order to deal with it's little idiosyncrasies.
Scleroderma is a most bizarre disease and you're quite correct in your observation that few people, including the average doctor, know very little about it. Certainly, at first my friends were very intrigued when I explained about it to them, but quickly became bored, as I insisted in regaling them with every minute detail of my treatment, so now I very seldom mention it, as the novelty has worn off and I have no desire to become a social leper.
I'm sure we will have other members along to offer you advice and support.