Dubaibugs on "Bedbug driving me to depression"

Ok so here is my story. Was getting bitten since a month and didn't realise that I had bedbugs. One day while sitting on the bed in the guest room saw one crawling out and got freaked. The guest bedroom is the one where my brother stays. He moved in with us since 8 months back. Behind the bed were 2 foam sheets. They had made colony there. I freaked out and threw the sheets. That was a wrong move. It must have spread the bugs in the building. In my bedroom I was getting bites but didn't see any colony there. I checked everything. But didn't see any bugs just a cast skin. Told my husband and he sprayed the brothers room. Moaning know this is wrong. What we didn't notice was the problem was a lot bigger than expected. We saw bedbugs crawling in the wall. After 2 days my husband sprayed our room. Still we were getting bit. My husband and brother don't react to bug bites. But me and my 2 kids ...1 yr old and 5 yr old get bit and have a red raised area with lots of itching. After still getting bit I convinced my husband to get a pco. The PvP inspected the house and saw bug stains only in the brothers bedroom and he saw three to four harbourage sites on the cieling, where wall meets the ceiling. How on earth did we miss that!
That explain the bed bugs on the wall in the bedroom and the one I saw outside on the passage wall.
Ten pco treated twice with chemicals 15 days apart. But still seeing nymps. And one day after treatment my son got bit in the living room while sleeping.he fell asleep on the couch. So I suspect They are in the couch. It is very plush couch so I think I need to throw it away.
Now the my main concern is since we initially self treated (big mistake) they must have spread in the whole house. We have a centralised ac system and a central exhause vent running through the whole building. We just shifted in the building 7month back. So I am afraid I must have spread it to the entire building nd that they are hiding in the exhaust vent and ac vents! What should I do . Please help me guys . It's driving me crazy and in to depression! How can I solve then issue and avoid them spreading.