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Refrain your stress, depression and anxiety and give camping and cooking a go, start small and grow your ambitions one step at a time then.
Go to the Peak District, the South Downs, Lake District. Then venture to Europe, start from western Europe, maybe Germany, France and Belgium. Do little things first, before dreaming going to Mongolia. It's far and exotic but it doesn't mean you can't have an adventure unless you go that far.
I'd say at most you may get a yurt in Mongolia, probably not at that price point, definitely not hotels and restaurants every night. You may get a cook though, that does the cooking for the whole group. I'd do it for a couple of grands!
seems a bit rich for my blood then.