She is 5 1/2 months old and I understand there are a lot of developmental changes now but she has totally forgotten how to self soothe and go to sleep!

We went in holiday for a week so her routine was disrupted and it was a bit warmer so I did end up feeding her more often as I was worried about dehydration. She had also just started on baby rice (recommended by HV) as her weight gain had slowed down. And shes teething although hasn't cut a tooth yet and we had the in laws living with us for a month (they have gone now). She used to sleep 11-12 hours with 2 feeds and during the day would feed every 2.5-3 hours and sleep for 30 mins every cycle. I would be able to put her in her cot, rub her tummy and she would suck her thumb and go to sleep. Now she wriggles around, cries, scratches at her face (I had to take her to the dr as I thought she had an ear infection with blood coming from inside her ear. Luckily it was a deep scratch and her ears hurt due to the plane). The only way she will sleep is by feeding or I managed the other night to sway with her in my arms, but she had calpol so was probably sleepier. She is a very active and alert baby and just won't switch off. I understand she can probably be awake longer now in between naps but it is a huge battle. I tried CIO but then gave in as she got so hysterical. Im starting to think something is really bothering her as it's not like she has never learnt to sleep.
Help please!!

Edit - I see there are a lot of posts about sleep problems. Just wanted to send hugs to everyone and hope it eases soon xxx

My two are just (oh lord hopefully) coming out of this now. Its been going on for about a month.

They were both sleeping through, bed at 8pm, feed at midnight, boy twin occasionally fed at 4am but other than that perfect. They were both great at self settling, girlie choosing to suck her thumb whilst holding a muslin, boyo smushing his face into his muslin. They had/have both totally forgotten about this!! They were both waking up every 30-45 minutes so we were having zero sleep.

I think that with all the new stuff they learn throughout the day, it pushes out the stuff they already know, like how to self soothe!!! ARGH!!!

Anywho, just wanted to say, it does eventually get better. They will remember how to self soothe again........eventually. It completely sucks whilst they are in the thick of it, but there is a light at the end of the tunnel!