Welcome len. Well done for getting to day 5.. Sleep is probably the worst part of it but you will find that 1 night going to bed you will just fall asleep and your pattern is all back to normal. The panic attack side don’t sound fun. Maybe worth a visit to gp maybe they can give you something as could be anxiety. It is a very dark thing but once your body get rid of it all you will start to improve and feel more you.
This is a good place to be on going through withdrawl. Does any family members know and do you have the support around you?