Urgh! It sounds all very familiar!!! I found it would get worse when dd was dropping one of her sleeps and consolidating them into fewer but for longer. I remember carrying dd all day most days with no difference. She would have 5-7 short catnaps and be super clingy and tired. For us 6 months was better, and she was having 3 clear naps, one of them for 2 hours.

Teaching self settling did help for us...but it's a mission and not necessarily pleasant, and i still have doubts about it tbh