Postpartum Sickness!?

Amymay
Is anybody else experiencing PP sickness?! I'm 6wks & 2days PP after a planned C section due to babies weight. Last Friday afternoon I began to feel really queasy & ended up being physically sick 3 times. After the 1st time came a mini fever which subsided the day after. Yesterday I got through the day but today I have woken up again to vomiting & now diarrhoea 😓 
My baby is breastfed & I'm worried I won't be able to produce the milk he needs if I can't keep down food myself?!