Started job - have major doubt

I would like your opinion. I was made redundant in April. I started work with a North American start-up company last month. The company is recruiting too quickly and the scaling up is causing massive problems. My gut feeling was one of doubt but I decided to give it a try for a month.

The main problem is that all my colleagues are in Toronto and I don't have contact to the few other Irish based colleagues in Ireland as they are all in sales and I am in collections. Also I have noticed that the market I was recruited for has been delayed as they don't know how to enter the market in question so I am working in an area which is very much like "payday loans" for the UK market. This is an area I worked in 15 years ago and Christ it is stressful because most people are non contactable or just don't give a s**t. While my manager is a nice guy, I have realized that it is very micro-managed with results on very much everything you do. That they have recruited me feels like the "cart before the horse".

I feel drained, stressed out & not motivated. When problems arise in the mornings, there is nobody to turn to until mid-afternoon when the Canadian's turn up. Financially the job pays well but I have been approached to work part-time for a job that I really enjoy and I have my house rented out for good money. Also I have other things in the pipeline so am in no rush.

I don't want to put something on my CV or Linkedin when I feel that I will not stay there. I am going to have a difficult conversation with my manager and advise him I am quitting as I feel that it is not working out. I get the feeling that staying would only delay the inevitable.

Cheers