Hi Rosebud, I sympathise, the pred also makes me feel dreadful. I've not taken mine today. My doc gave me a higher dose for only 3 days but omg, what a mistake. A lower dose for a longer time might have been better. I've lost 3 days with being off my head, very little sleep.
Anyway, it just doesn't suit us all unfortunately.
In answer to your Q, yes, you do feel dozy & lethargic. Due to your oxygen level going down a bit, you need to slowly deep breath to get the sats back up. Breath in right to the bottom of your lungs.
I've practiced the deep breathing so much that it's now second nature, I cannot bear the feeling of being brain dead. There's more to it but I'm not a doctor so will leave you to put 'understanding sats' in your search bar or the BLF search.
I really think it would be helpful if you rang the BLF helpline for advice on what to do next.
The worry is that the infection won't be better, the weekend is coming up so you could regress before you see GP. You should always see GP on last day of antiBs to see if chest is okay - in my opinion.
Please ring 03000 030 555, cost of a local call. Ring today as they're not on duty over weekend. All the best P