Back on ESA

Hi again, I posted 3 weeks ago that I didn't think I would be able to continue working,I was on ESA for 12 months, then decided to try work part time, 6 weeks later I now know I'm just not fit to work, and so within the "linking Period" time scale have phoned ESA and said as such, they went through the usual questions with me, then said I would have to go on the assessment phase, even though I get Higher rate Mobility and Lower Rate care component.I also have to get a "Sick Note" from my doctor,I can't see him until 19th April, that was the 1st available apt.Doc has already written a letter to say that I am unfit for work back in December 2010, this is what helped me get DLA; My question is, will I have to go through the whole 13 weeks of assessments and work interviews?the lady on the phone seemed to think so...

So to continue with story....I got a "Fitness Note" from my doctor, he dated it for 3 months, So now my question would be "will this suffice for the period of processing my ESA claim within the linking period"? My doctor thinks it's ridiculous if I have to be re-assessed all over again, and quite frankly, so do I, after all, it all takes up government spending for no real or beneficial gain to the DWP. I sent with my "Fit note" my letter from the Tribunal with my DLA award, the letter my doctor had written for the Tribunal explaining my illness, and a cover letter from myself being very explicit about my medical condition, so what do you think? will I have to go for another Atos medical?