Well I've sent the message

Hi been stressing about this since Friday.Had an emergency appointment with my doctor as I've been feeling really low and stressed I've been referred to a psychiatrist Dr who I'm seeing on friday.I've another sick note. Sorry to let you down.I'll keep you informed after my appointment Friday. Sorry

All I've had back from my manager is ok no worries the Dutta not replied.

I'm not in the Union in our workplace as they don't really have a lot of power.

They've offered for me to go back and do 1 hr or if I feel rough not to come in the following day,to be fair they've been really good its examples like Thursday night which scare me and put me off going back.That's what I'm expecting they'll say