Husband is away on job! How do u cope

Ever since my husband went to work in another state I’ve been so so down and crying a lot.. I really need help to change it I’m so miserable crying all the time I have an 18 month old daughter and I can’t stand for her to see me like this, but it just comes out... I’ve been dealing with postpartum depression ever since she was born I’m on meds, but it’s not working right now.. can someone give me an idea on how I can be happy again and not sad all the time..