Why are we feeling like this?

Me, F18 and my partner M18.

We have been dating for only 5 months and we have been together nonstop since, its only been a short period but we instantly clicked and we are as if we are one person.

tl;dr: me and my partner having side affects when were away from eachother for too long

He has recently gone on holiday for 10 days and this would be the longest we have gone without seeing eachother or even being able to call at night like we usually do, and were both struggling difficulty, but not as much mentally but were both getting physical affects...?

Ever since he left for his holiday ive been unable to sleep through a night and keep waking up in constant panic and having extreme anxiety at night and throughout the day with symptoms like nausea, forehead aches, over-eating, constipation (an odd one!), not wanting to go outside, trouble sleeping, emotional, and unusual excessive discharge from downstairs?! (VERY odd). My partner is also going through headaches and has been sick a few times and been staying up late too which is unlike us both.

What is the meaning behind this? Ever since we have been apart we have both been feeling ill and were a bit unsure as to why? its get a bit weird that were feeling very similar symptoms even though were not ill, we even do the same things and it makes me sound crazy!!