Is this sleepiness normal for a 6 weeks old?

In my last thread I have told that my baby hardly sleeps,now after our train travel from chennai to hyderabad he has changed but that is worrying me,he gets up around 7 in the morning had milk for only 10 mins and then sleeps(sleepy while having milk also),then gets up again at 8 has milk again for 30 mins then sleeps,then again at 9 and has for 5 mins or so and then sleeps and this continues till 3 o'clock and from 3 he gets up the same every one hour but wnated to nurse for 30 mins each time within one hour gap(usually he nurses for 30 mins in a 2 hr gap) and this continues till 10 pm(i get exhausted),but after 3 atleast he does not seem sleepy when nursing whereas in the morning he is always sleepy when nursing,nighttime is a peaceful time for him he nurses once in 3 hrs for 30 mins and sleeps well,is something wrong with him,why does he seem sleepy all the time,on friday we gave his vaccination,but this behaviour started on friday morning itself,so I think it has got nothing to do with vaccination.any input would be helpful.should I go to the doctor immeadiately?do you think he is just tired from the train journey?

he also has a smelly stool and passes gas a lot.