Can stress in the third trimester of pregnancy harm the baby? What are some symptoms?

I'm just curious because I've been having severe cramps that keep me up at night.. I've done plenty of blood tests and everything comes out normal besides me having back pain and sciatic nerve pain and being sleepless, dehydrated, anemic and having gestational diabetes. So I have been feeling very depressed along with everything going on. My boyfriend cheated on me in the beginning of my pregnancy and then I found out I was pregnant. It's been affecting me so much and I've never told anyone about my mentality and how suicidal I can get sometimes... it's hard not to compare myself to 2 other woman where he lies about texting and one of them, which he sleeps with for a month... I'm so lost and don't know if I should tell my doctor because it's personal matters..

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