7.5 months - sleep regression

I’m really struggling - my kid has had some really great spurts of sleeping including 11+ hours straight through the night. It’s normal for him to wake once for a feed and go straight back down. But lately it’s been every 3-4 hours like as if he was a newborn again. And he won’t put himself back to sleep anymore, sometimes he is up for an hour plus in the night and it’s really wearing me out. I am trying to be consistent with my routines but also my husband has to get up for work at 4am so I feel bad ever letting the baby cry at night. Need to do some more serious sleep training- maybe I should send my husband away for the weekend so I don’t have to be concerned about disturbing him? 🤷🏻‍♀️