If you come back to the UK it will inevitably take some before you can see a mental health professional during which period your current 'depression' could worsen.
As you'll be seeing a pyschiatrist in less than a week's time, I would advise you to go with flow as much as possible until you have a diagnosis at which point you will be better placed to make life-changing decisions which will impact on your dc with the help of qualified personnel if necessary.
Your dh may be a controller by nature but, nevertheless, if you have been exposing yourself to danger, and putting him at risk of std, by having S&M sessions with strangers without his consent, or without his knowledge, it is not too difficult to understand why he may lack trust in your ability to care for yourself and, by default, your dc.
Given recent events in your relationship, if he was concerned that you and dc were not home when he expected you to be, and if he was unable to contact you on your mobile, this might explain the blow up row you had earlier.
My concern is that you've described yourself as a slut and putting yourself in stranger danger could be a form of self-harm.
Obviously I can't see the bigger picture but it could be that your dh is, in your view, behaving as a paternal figure and you are effectively acting out against what you perceive as his authoritarian behaviour.
Regardless of your 18 months of therapy, it could be that you have a residue of long-term unresolved issues which may currently be adversely affecting your judgement. If this is the case, marriage counselling may be ineffectual until you have addressed any underlying malcontent within yourself that may be manifesting itself in your relationship with your h.
I'm curious as to why you chose your mn name. Do you feel that you can particularly relate to Frida rather than any other artist?