11 week old screaming and going bright red

[Glago2017]

Hi there was wondering if anyone can give advice or have been in a similar situation.

My 11 week old dd has started high pitched screaming, going bright red and rigid. It sounds awful and I'm worried she is in lots of pain. She has always had a good set of lungs on her but this is a whole new level. Nothing seems to happen before she does this. She can be giving lots of smiles one minute then screaming the next. I give her a dummy which calms her down for a minute or two but then she starts again until she tires herself out and goes to sleep. I obviously pick her up and try to settle her too.
I have been to the doctors today as I think she has a bit of reflux and have been prescribed gaviscon. The only thing is she only poos 2/3 times a week and I am worried this will make her constipated. I told the doctor this and he said her tummy was soft.
I have tried infacol, tommee tipee anti colic bottles to try and make things better.
She has also recently been drooling lots, sucking her fists and blowing bubbles.

I first thought it was just temper but I have read that babies of this age don't have tempers.
Any advice would be greatly apprectiated!

[Wetwashing00]

Teething?

[Glago2017]

I was also wondering this but articles I have read say babies of this age produce more saliva than they swallow and that is why they drool. Also don't know if she has just found her hands in the last week or so and is exploring them.