BM Dropped Drastically

Hello mummies, seeking for some advices here. I was down with fever, flu and cough for around 2 weeks. During this time my BM has decreased drastically. From 200-300ml per pump to less than 50ml per pump now. Feeling so stress and sad about the decrease. Will my supply come back gradually or should I just wean off breast milk? My bb is currently 4.5 months and been on FM as I was sick and taking medicine. Thank you in advance for your advices