Coping with 3 kids when 2 of them are autistic

Hello

this is my first ever post. I hope someone can help. My 8 year old son was diagnosed with autism at 4yrs old, when our second child was 2yrs old. Then we had a third child who is now nearly 4. She has been displaying some pretty clean signs of autism, and to be honest because we hoped she was just copying her brother so we didn't approach anyone about it until this August. Our GP was very kind and could see our concerns straight away  and referred us to paediattrician and to child mental health services. We are STILL waiting for those appointments. But life with our diagnosed autistic son and probably autistic daughter is getting worse as her issues are building and his are getting worse. Life is becoming extreme and while dealing with both of their meltdowns and anger, I also have to think of our totally neurotypical middle child and her needs. The school our son attends have a special provision for children on the spectrum where he is cared for and his teachers have been fantastic helping with advice for both our son and daughter but what they can't tell me is what it's like to cope as a parent with TWO children on the spectrum. They both set each other off a lot and I feel like I am juggling one meltdown and then another continuously. Are there any parents out there who understand? Sorry for such a long post. Thanks all X