hypochondria by proxy with toddler

I'm having crying spells these past 3 days. Idk if its because my toddler is teething or having other issues. He's been fussy and crying at night more. When he's not well I collapse. I don't want to be that mom but I was always hypochondria with myself and now with baby. My son hadn't eat anything since Tuesday and he's been gagging and vomitting. It's worrying me and I'm not even eating. I dropped 2 lbs quick from going into deep depression. I keep getting crying spells and napping each time my toddler naps. I used to be productive but this week has hit me hard.