Teething and separation anxiety are the 2 big things that I’ve noticed for this age group in both my kids. Very painful indeed. You might want to consider starting to sleep train your LO and teaching him how to self soothe? That in itself is not easy, but it’s quite worth it for everyone. Just a suggestion.. and hope things get better soon. I think my LO was like that for 1-2 weeks before it got better.. she just had another regression last week (coming to 8 months). Sigh. Lol.