2 year old sleep!?

[Emjoy91]

I have a 26 month old and up until around 2 weeks ago his sleep was great, he'd go to bed at 7/7.30 and sleep through til 6/6.30am not waking up. However recently he is funny going down and wakes up in the night, screaming and calling for us both, it's so exhausting and he used to sleep so well so it's hit me hard!!
I thought it was a sleep regression but he started settling sessions at nursery a couple weeks ago and not sure if he's going through separation anxiety as he ia mega clingy to me in the day and hates when i even pop out to the shop! I don't know what's going on with him😭😔its like a switch has been turned on overnight and he's changed his sleep patterns and can't sleep without me! Can anyone relate or offer support, advice etc?
Thanks

We had a horrendous sleep regression at age 2. Completely unable to settle, awake all night etc. one time she woke up at 11:30pm and just did not go back down until 6am when she had to be up for nursery at 7am!

It seemed to coincide with her dropping the daytime nap.

I don't have any advice or useful information to add but just wanted to share our experience. It almost broke me at the time but it lasted for about 4 weeks then got better