Pregnant and depressed

I’m a mom of 2, after my second baby I got PP depression. I took meds and went to counseling and things eventually started getting better. I got pregnant again(I’m 20 weeks now) and my husband left to work out of town 3 weeks ago. I see him weekends but we did everything together. We would drive to work and back home together since we worked close by, get home and cook together and then he would help me tremendously with our kids. Now that he’s gone our son has been very sick 2 times. Last night I woke up to him vomiting all over me and my daughter and of course himself, with high fever and didn’t eat anything all day long. Took him to get checked and sure enough he has flu and a stomach virus. I get back to work today and had been late and leaving early almost all week due to my kids crying for myself and my husband most days. They called me in and I got fired from my job. I have been prescribed depression and anxiety meds but I’m scared I’ll get hooked on them and start to depend on them like I did before. My husband has no clue about this and most of the stuff that has been happening at home because I don’t want him to be distracted during work since he’s working in a dangerous job site. I’m breaking down and I don’t know how much longer I can take this for. I’m so heartbroken and I miss him tremendously