Feeling lonely after hookups

I am in my mid 30s. For the last year, I am overly involved in random hookups. sometimes 2 hookups with new people per day. I am always looking for new guys. and after a hookup of an hour or two, when they /I leave, I feel so lonely and empty. and immediately start looking for other guy on the apps. ( and I am still horny) . I don't know what's wrong with me lately. I am not looking for any relationship right now. ( I have had nice relationships in my 20s). may be I am just addicted to new random guys. anyone feeling the same and how to control that?