Sickness...when would you ask for tests?

[Baddz]

Hi
My ds2 is 6 and has a rough couple of years health wise which culminated in him having an adenotonsilectomy last summer.
He hasn't had tonsillitis since but seems to be vomiting more and more...
He had a d and v bug in oct last year.
Another one in nov and then has has 2 episodes of being sick in the last 2 weeks.
Should I be worried?
He said tonight he felt hot, then got upset then threw up :(
He was fine up til that point.
Same 2 weeks ago.
What can I do?
He is asking to go to the dr as he feels so poorly :(
No temp, no rash, no pain (except tummy)
I'm getting concerned.
Ds1 wasn't a sicky child at all and can go for years between bouts.
I am quite worried.
Thoughts? Is this just "normal" for year 1 and immunity?

Sounds perfectly normal to me. My whole family seem to have been ill for months! It has been a really bad winter for viruses

Yes it has.
But I only one of the episodes was a bug (complete with runs too)
The others were just suddenly feeling very ill, hot then vomiting once and sleeping then Back to normal next day.
There has only been 2 weeks between these last 2 episodes
I am wondering about allergy or intolerance?
My mum has coeliac disease.
.