Hi
I had exactly the same problem with my son at around 2 yrs old - all of a sudden, he wouldn't eat anything that he used to, nothing that I tried worked.
Like a fool, I tried allsorts, even at one point cooking about 3 different meals for just one sitting to try & get something down him. HV didn't seem to interested - just said as long as he was putting on weight, drinking & peeing etc, there was nothing they could do.
They got me to write down a list of exactly what he ate & when he ate it to see if there was any kind of pattern (there wasn't but I remember to this day one days food listing consisting of 4oz milk, 2 spoons cereal, 6 pasta shells & fruit!!!). He wasn't quite as bad as this with the childminder but not much better.
This went on for at least 9 months partly because my dh kept letting him have things like yoghurt & fruit when he didn't eat his meals. It eventually came to a head when dh was off work just before xmas. We were out shopping & ds actually said he was hungry & could he go to the cafe - we couldn't get there quick enough!!!
He said he wanted sausages - great, we ordered them & would he eat them???? No chance. No amount of dh pleading would get him to eat even the tiniest morsel.
Dh works really long hours so doesn't really see much of ds at mealtimes and he says he thought I exaggerated how little ds ate. Anyway, we agreed there and then that if he didn't eat his normal meals, he had absolutely nothing till the next mealtime. I didn't think dh would stick to this because he can be a right softie and sometimes finds it hard to say no to darling ds (not like me!!) but he did and I was so proud - it took less than a week before ds was eating everything off his plate and he still does so now!!!!!!
Now, I'm not saying you be this harsh with yours seeing as he's only 7 mths but they're clever beggars and soon realise they have us like headless chickens running around after them.
its only now I can see that the HV was right - he was healthy & obviously taking in enough calories because he was gaining weight but at the time I thought they didn't care one jot about whether he starved to death or not (OK, a bit dramatic but you get my drift)
If he's taking his milk ok, don't stress too much - he'll eat when he's good and ready. Obviously, if he starts losing weight then professional help should be sought
Lots of luck (and no, I'm not jealous you're in Dubai and I'm stuck here!!!)