PredniSONE and muscle and bone

I was prescribed Prednisone for sinusitis and bronchitis. By day three I noticed I was taking 6 pills versus the 3 prescribed. I called the pharmacist and they recommended I take 1 for each remaining day. I declined, because by then I was experiencing a lot of leg pain. I thought I had a blood clot. Now that it's day 6 I've experienced muscle and bone pain throughout my body. Last night while lying down I felt lightheaded and like I was going to blackout. My legs are weak, I feel like I'm having an outer-body experience, and I'm restless. I've gained a little weight and have a dark red/purple rash on my chest. My stomach is still bloated, but does not hurt. I hope this ends soon. God Bless you All!