can you take panadol or ibuprofen to help with the fever?? Both are safe for breastfeeding.
Stress really screws with your ability to express - much more than it does with your actual supply. So the more jackson sucks the better things will be. Put a towel between you and him to avoid overheating him if you have to - or try the patented minimal contact bf, where you find a lowish chair, put bub on a table, sit down and plonk the nipple in.

If you are having trouble breathing, some of the nasal sprays are also safe to use while feeding, as are some cough suppressants. See here: Breastfeeding and medications
for more info.