Just released from hospital question about dizziness and weakness!?

I'm 32 yes old and have been sick since start of month. Overall I've had a weeks supply of antibiotics and steriods twice and was getting mo better so admitted to hospital where I received oral and iv antibiotics and I got alot better quickly. I had a chest infection that turned nasty! Anyway today I've just been released from hospital and I've 5 more days of 2 lots of antibiotics to take. But since I came home I feel very weak tired and very dizzy when I get up and walk around. Is tat normal?? Will the amount of antibiotics I've taken over last 3 weeks make me feel so weak tired dizzy and sick? How long can I expect to feel like this ?any advice on how to recover better!