How many units of Insulin are you using daily?
If you're stressed out it's quiet normal needing more Insulin, but your description of doubled Insulin suggests that either you've some mega resistance or may be your pancreas was producing *some* Insulin but now has completely stopped hence more Insulin required.
As for carbs, if you want to avoid big spikes try the slower digesting stuff i.e. brown rice, rolled oats & etc. Exercise - take your pick...Choose something you enjoy, building a bit of muscle is never a bad thing as they enjoy using up glucose!
What was your last blood sugar average, and is your healthcare team aware of this rash?
If you haven't already, book an appointment with your GP/Diabetes specialist.