How can I help my dad without going crazy

I have a five month old son. I live thousands of miles away from my parents. I am not too close to my father but was always to my mother who has dementia. I have had severe depression most of my life and this is really taking it's toll on me. my husband has volunteered to be the middleman in some of this, trying to set up skype so my mother could see her only grandchild. And so forth. My father had my mother go to a regular GP at my request several years ago and got a general diagnosis. I wished so badly she could get a lot of tests. Especially as my father keeps saying she is getting worse. I try to talk to her. But it kills me inside. I stop eating for days. So I don't know what to do. I want to help my dad. I want to see my mother one time with this baby. I also don't want to go into a dangerous depression.

How can I help my dad without going crazy

I have a five month old son. I live thousands of miles away from my parents. I am not too close to my father but was always to my mother who has dementia. I have had severe depression most of my life and this is really taking it's toll on me. my husband has volunteered to be the middleman in some of this, trying to set up skype so my mother could see her only grandchild. And so forth. My father had my mother go to a regular GP at my request several years ago and got a general diagnosis. I wished so badly she could get a lot of tests. Especially as my father keeps saying she is getting worse. I try to talk to her. But it kills me inside. I stop eating for days. So I don't know what to do. I want to help my dad. I want to see my mother one time with this baby. I also don't want to go into a dangerous depression.