Communication in relationships

Hi, I am anxiously waiting an assessment and have been for a few months now. 

Recently I feel as though my feelings, thoughts & emotions on a day to day have become more difficult to manage. It is affecting me daily and especially is affecting my relationship.
I want to be able to explain why and how I am feeling a certain way or had a reaction to a trigger or situation but it seems to be becoming more difficult to do so and I feel as though my partner doesn't understand this and it is becoming draining trying to explain ( they have described it as me going round in circles). I feel totally misunderstood and I end up either exploding through frustration which is not normally me or just completely withdrawing - thus being after trying to explain and getting upset and annoyed that I am not being heard or feel understood.

My partner is aware of my referral. However, when I bring up things that may be affecting my neurodivergence, it isn't always received well or I'm told 'everyone feels that sometimes'

I want to feel like I can communicate properly and be understood but I'm at a loss at the minute and it's really affecting my mental health.

Does anyone have any tips on managing my relationship alongside feeling overwhelmed myself?