Failing... anyone ever get the feeling..

I'm 28 weeks pregnant. Mother of a 17 month old who is always on the go.. have a mil who is amazing.. since I've been pregnant I've gotten so exhausted that my mil takes over.. I hate it but I'm just so tired my little one never sits unless on the iPad.. I know I'm not the only one in this predicament but I just don't know what to do at times.. my husband is great but lately points out everything I don't do.. I feel like I'm failing like everyone would be much better without me.. I don't know if this is a phase but I don't know how to fix this.. another thing we live with my in laws so our family dynamics have changed and I just don't know if that's the root.. but I'm unhappy and I feel like everyone's unhappy with me..