5 month old teething baby in too much pain to nurse.

Hi, my baby is 5 months old and has been teething for the past 2 months but recently it has gotten worse and I struggle to feed her. She is breastfed.

She clearly wants to nurse but pulls off all the time, cries, puts her fists deep in her mouth etc.

When she finally manages to suck for a minute she is so tired she falls asleep and falls of the breast.

I am worried she isn't getting enough and that my milk supply will suffer. I don't have time to express as i am spending all my time trying to nurse her( she used to take 20 minutes but will all the pulling off and trying to latch it can take an hour before she's comfortable enough to suck).

I am at my wits end. I feel like i nurse her all day even though she is not getting much to eat. I don't have time for anything else.

I have noticed her behaviour getting progressively worse and i think it's gonna peak soon. How long can this last? Has anyone else struggled with something like this? x