Vodka, your posts at Tue 18-Aug-20 12:18:28 and Tue 18-Aug-20 12:24:32 did very much suggest that one steam treatment would solve OP's problem. Those posts seem to contradict your other posts where you mention all the other stuff you did.
Steaming is useful but on its own will not solve the problem - as you know because you threw everything at it, and as OP knows because the company she is using use regular steam treatments.
Mattress encasements and interceptors can be useful depending on where the bed bugs are - OP says she has an infestation in the headboard and bed frame so her bugs will not be at all impeded by either of these.
The other things you suggest - DIY bug spray and especially bug bombs - are ineffective and can be actively harmful because they can cause the bugs to scatter and will also increase resistance. So if you then decide to hire a pest control company that uses chemicals it's likely to require more treatments to more rooms in your house, more pesticides (which are not harmless to human health), be less effective and more expensive.
Other people have suggested OP should throw out a load of stuff. There are two problems with this:
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unless items are properly sealed before moving and disposed of very carefully, you risk spreading them.
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as OP has discovered with her son's bed, unless the bugs are eliminated they are very likely to just reinfest the new stuff.
When I was dealing with bed bugs last year I found the Bedbugger site very useful. Unfortunately it disappeared at the start of this year but some (most?) of it is still available through the wayback machine.
This is a good place to start:
<a class="break-all" href="https://web.archive.org/web/20181128232641/bedbugger.com:80/2007/01/20/faq-think-you-have-bed-bugs-some-dos-and-donts/" rel="nofollow" target="_blank">web.archive.org/web/20181128232641/bedbugger.com:80/2007/01/20/faq-think-you-have-bed-bugs-some-dos-and-donts/
The recent bed bug resurgence hit the US about 10 years before it got going in Europe and some of the US university sites have a huge amount of useful info. Ohio State University has a good site with links to lots of resources from other unis:
u.osu.edu/bedbugs/
Absolutely I am invested in this, I never want to have to deal with those fuckers ever again. I haven't felt the need to tell anyone to fuck off though, or called them a nasty ablist term, or suggested they are drunk.
If you really want to see some overinvestment, here is world expert David Cain having a flame war with another world expert over whose bit of carboard is the most effective:
<a class="break-all" href="https://web.archive.org/web/20171226070309/bedbugger.com/forum/topic/new-monitor-available-independently-tested-by-richard-naylor" rel="nofollow" target="_blank">web.archive.org/web/20171226070309/bedbugger.com/forum/topic/new-monitor-available-independently-tested-by-richard-naylor
There was another thread where he got into a screaming fight about DE vs. Cimexa but it would be difficult to find now it's all just archived.