My possessive mother in law

Recently I went for a business trip, and when I came back, my sis in law ask my son if he miss me. My mil gave a disgusted look. All along she doesn't want my son to be close to me... but I wonder why can't my son be close to me.. I am the mum. I don't feel my husband know the pain in me... who is so evil to want the child not close to the own mum.... I really have enough of my mil... I can't trust her at all with my son..she wan my son to be closer to her than me... nobody understands the fear and pain in me... since my son is born, she being saying nasty things to me. Sometimes i feel so stress that i feel so despair about my life... my husband is also definitely closer to his family than me. When i was pregant that time... i had bleeding on his niece birthday and he gave me a look like i purposely try not to attend the birthday. After going to hospital for the jab, i still have to go to the birthday celebration of the niece...I feel so alone.. #adviceplease #firstimemom