health What's wrong with my peppers?

[ThePizzaMonster]

So I was away from home for a couple of weeks and I've come back to see my plants struggling. My impression is that they may have been overwatered while I was away but I can't really tell by looking at them. What is wrong with them? The ones that seem to have problems didn't grow at all for the two weeks I was away.
 
I've checked for bugs and didn't see any. I've never fertilized them so that may be an issue too.
 

Newer leaves have fallen
 

The small leaves on the stem are becoming brown
 

Older leaves don't look that good either
 

Newer leaves on other plants seem to be struggling too
 
 
 
https://imgur.com/a/sKvXw

 

[NIbbles]

I don't see any thing wrong. you have lots of buds for new leaves and the leaves don't look yellow either. most peppers grow slowly. most of mine don't grow at all for a few weeks and suddenly shoot up. if you do see any other bad signs take a picture and show us

 

[CAPCOM]

How damp is your soil? And how often do you water?

 

[ThePizzaMonster]

I don't see any thing wrong. you have lots of buds for new leaves and the leaves don't look yellow either. most peppers grow slowly. most of mine don't grow at all for a few weeks and suddenly shoot up. if you do see any other bad signs take a picture and show us

 
The small leaves on the buds are brown and falling and the newest leaves have all fallen. Also the leaves are curling up and papery.  I did find some bugs which were too small and I hadn't seen.

 

[ThePizzaMonster]

How damp is your soil? And how often do you water?

 
It's quite dry currently actually. I water them about twice a week.