How do you draw the line between emotional illness and simply going through crap?

Anonymous
Crying
I can't stop the negative thoughts. I try to tell myself to stay strong but I'm struggling. I cry anytime and anywhere, and it's crazy, I can't control it.

Insomnia
I can't get to sleep and sometimes when I'm finally able to, I wake up a few hours later in the middle of the night and can't get back to sleep. As a result, during the day, I'm exhausted, even now. I bought this lavendar-scented eye mask thing which warms up and is supposed to help me sleep but it's not helping...

Stomach problems
I don't have much of an appetite and I get a stomach ache after I eat. I've been going through this for months and I've been receiving pills from my doctor but nothing is working. I've actually seen two doctors about this and they both said it's stress.

Breathless
I feel like I'm always sighing or taking deep breaths. I always feel out of breath and my heart rate is fast. Even right now.

Hallucinations
Lately, I'm in bed with the lights turned out and I see a roach crawling up my bed so I turn on the light but there's nothing there. i do this several times till I stop seeing it.

Anxiety
I got into a fight with my bestie a couple of months ago over this whole thing. Someone special to me recently left town and from when he told me till the last day I saw him was the most agonizing time ever. It was like waiting for a bomb to go off and not being able to do anything to stop it. I was going crazy over how much I'd hurt after he left - I was right to, because he's gone and I feel like crap. But my best friend claimed I was overreacting and that I thought of him as someone I couldn't live without. Maybe she was right, maybe I was overreacting and that's why I wasn't able to accept reality till the end. But I don't feel like I've been overreacting. I can't control how I feel and he and I had a special bond - we were close friends who shared anything.

Now, he's not contacting me and won't reply to my emails. He may have cut me off, just like I was fearing...
Updates
+1 y
Sorry, this was kind of indirect. My question is whether I'm going crazy or I'm overthinking/overreacting?
Updates
+1 y
oh and my guy friend leaving is not the only reason I'm feeling like crap
How do you draw the line between emotional illness and simply going through crap?
3 Opinion