Help! Seriously ill in Thailand. Bacterial infection but reacting to antibiotics and need advice. Any doctors or people that have experienced before?

I had what seemed to be food poisoning on Christmas Day (25th) V&D very badly and then seemed to recover the next day however I'd get random waves of nausea again the next couple of days. I took a turn on 29th and ended up in hospital. They told I had bacteria in my blood. Pumped me with fluid and then put me on an IV with antibiotics (poli- cifloxin) and sent me home with the oral tablet version to take 2 a day. However, each time I've taken them I wake up tremoring and shivering and can't sleep coz of dizziness and breathlessness. What can I do? Do I go back to a hospital and get more tests or ask to change anti biotics? Worried it's been a few days and still no good. However haven't vomited since Christmas Day but still have symptoms such as dehydration, dry mouth, fatigue, nausea, dizziness and tremors. Struggling to eat also which won't be helping. Any advice on what to do or who to talk to please let me know I'm desperate and worried.