How much fruit does your LO take (mixed in with other items)? My DS can take an citrus fruits as they really upset his stomach and burn his bottom
I find that some days DS will eat fruit fine, such as a banana straight from the skin, whereas the next day he wont touch it. Sometimes I add a bit of milk to mashed banana, or put the fruit in yogurt and he takes it.
You could also try a smoothie? We did this the other day with melon as DS hates the texture, and mixed it with a bit of water and he drank a bit (the plan being he will get used to the taste then eventually realise he likes it and want to eat it!).
To be honest, I don't like eating fruit myself so understand your LO not liking it (although I love smoothies, etc!).
Hope your LO is better soon.