Hi my dc was non verbal and having 20-30 meltdowns daily at the same age. Agree on salt she was fab with him and supporting me to use my words better! We found a set routine helped so he got a sense of each day we also had a daily planner using real life photos which we would go through twice a day. We broke down the smaller routines - bed time, dressing etc and would have photos of the routine displayed in the appropriate room. Lots of pictures of new places before we visit, and sometimes a practice run before visiting places. We started to get a sense of what was and wasn't manageable and took the unmanageable off the table or if it had to happen for example visit to dgp he would have a iPad while we were there. We have never pushed him to do things because they are the norm (eg hugs /kisses etc) Food was never made an issue, we made him things he liked would sometimes put something on the plate or table he didn't like to try but no pressure t do so. We tried get extra veg etc in through smoothies/sauces rather than negotiation. We made sure he had consistency across people who looked after him and let a lot of the things you would normally pull a two year old up for go. Lots of time warnings for change and we used a sand timer. Stims and fixations were accepted and embraced as these are very soothing for autistic people. Unless it hurt like head banging for which we would put lots of cushions down and tried to encourage an alternative stim. What all of this did was reduce his anxiety/overwhelm which meant that he firstly trusted us and secondly found life more manageable. For discipline we did a removal from situation (timeout) for two minutes but stayed with him and soothed him, this would sometimes work as a reset and he would be calm after. We never discipline meltdowns or situations beyond ds capability. We never bring up past issues, once somethings dealt with its back to normal. When dealing with issues we always first look at what's wrong in the environment, what can we change to make things easier. Timeout was always a last resort for significant behaviour issues -hitting, throwing toys at other children etc.
Fir me I had counselling, I did a mindfulness course. Took up meditation and yoga. I gave up work first a while and then went back part time. Dh did a stress management course and took up exercise. We both started walking. This helped manage negative thoughts and bring stress levels down.
Ds is 7 and the most awesome human being ever. He has all the words now,! this was gradual from around the age of 4 with a massive leap around 6 years old. But his use of language is different to an nt persons , he still does a lot of echolia and can not take information in, in a group capacity. He fully toilet trained at 6 too. He's in mainstream school with a full time 1:1 and thriving, he has a best friend, he excels at maths and phonics, he loves space and planets and Mario and sonic. He has come along way with food and has an ok diet. At 2 I could not have imagined most of this.
My advice would be take it a day at a time, don't try to second guess the future and don't carry the past on your back. Read lots of books, there's some great autism support groups on Facebook. Try to take time for your self where you can.