I'm Too Weak

I fall in sick on my Malacca trip. We back home early because of my sickness; I don't know how to I catch a cold in the trip. My healthy just bad enough to make me sick even just take a cold bath. I'm keen to improve my healthy now. Anyone can recommend good and nutritional supplements for me. I intend to consume it as soon as possible. I do not mind to spend some money to get back my health now. Please let me know if you have any good supplements to recommend.