I am trying to figure out if this is too much in a month period of time, and not sure whats too much. I am going to go over a few days than a month because of the flight there and the flight back.
(I know i went over a month here, but it is because i left a day for travel times even though i figure some trips will take only like a couple of hours and we will take some night trains. We acutly have about 33 days, and I have already left out going to Belguim because it was so much.)
Days)
1)fly to London
2-7) London/the rest of england
8) travel to paris
9-12) Paris
13)to italy
14-18)italy
19)to swtizerland
19-23)switzerland
24) to netherlands
25-29)Amsterdam
30)to Germany
31-38)Germany
39)Fly home
That's not a bad itinerary, but trust me when I say that 5 days isn't enough for the "rest of England".
It's good that you're trying to give yourself 4 days or so in each place. Try to stick to one or maybe two places in that amount of time (within a country) and you'll probably have a better time! Frequently the "whirlwind" approach ends up being way too exhausting to fully appreciate all of the different places you're trying to see.
But, you'll only have time to visit one major city + do a daytrip in the surroundings, except for Germany where you're staying longer. So, it all depends on what you want. Maybe skipping either (or both) Italy and Netherlands to allow yourself to "get more" a country could be an idea to think about. You could book rooms in advance in every place, if you like to travel no trouble, and decide to change your plans. Then, you'd just lose the deposit.
Try to stick to one or maybe two places in that amount of time (within a country) and you'll probably have a better time! 
Frequently the "whirlwind" approach ends up being way too exhausting to fully appreciate all of the different places you're trying to see. 
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