5 MO sleep gone to shit

[Icklepickle101]

Until last Tuesday DS has been the dream sleeper. Gone down by himself at 7:30 sleepy but awake with his dummy and slept through to 6ish since he was 8 weeks, needless to say I was overjoyed.

The last week bedtime has been awful. It normally goes like this:

7:10 feed, grobag & story with dim lights
7:30 put in to cot with dummy and we leave him to it
7:32 inconsolable crying, pick him up for a cuddle put him back down, will usually go back to sleep
He will then wake up every 5/10 minutes for hours. Really horrible screaming we've tried calpol for teeth, gripe water for wind.

I don't know the best way to help him? We've resorted to putting him in the car and going for a drive for the last few days as it has been going on for 4+ hours!

Please help me, I want to help him sleep!

Not sure if it's worth mentioning he moved from breastfeeding to formula 10 days ago?

How are his nappies? Could he be constipated? Is he taking the formula ok? No signs of reflux/wind?

Is he sleeping in the day?

Sorry for all of the questions, it could just be a phase or there could be something bothering him. If he's really screaming in pain it might be worth seeing a doctor. If there's nothing causing his discomfort then stop with the car rides and be as consistent as possible with bedtime routine. Good luck, I remember how bad my daughters four month sleep regression was!

Normally 1/2 dirty nappies a day so I don't think it's constipation. He's rarely sick and doesn't have any problems laying down/sleeping in the day so I'm not sure it's reflux either? He had it when he was much smaller but sorted itself by about 6/7 weeks. He's a bottle monster and despite my best efforts to mix feed he doesn't want boob anymore, has 6ozs 5/6 times a day with 1 meal (veg purée normally at lunch) weaning started at 4 months so a few weeks before the sleep so don't think they are connected.

I did consider speaking to the doctor but it's only at bedtime when he's put him his cot, in arms he is fine so not sure what could be in pain?

He is good with naps and normally has 3 40 minutes.

If your certain there's nothing else wrong, and if he sleeps ok in your arms it doesn't sound like there is, I'd keep bedtime routine the same as before.

I couldn't do cry it out with mine, the pick up put down method worked for my daughter and the gradual withdrawal method worked with my son. Have you thought about sleep training?

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I thought he might be a bit little for sleep training?

Was thinking it could maybe be the dreaded sleep regression and may pass but I don't think it sounds typical of that?

he is still awake 2 & 1/2 hours after supposed bedtime