Have a look through the information on Nursing Strikes and see if you think this could be the cause of your problem. I know your baby isn't refusing to breastfeed but rather is being fussybut that could just be his way of doing it.
A nursing strike is when the baby suddenly refuses to breastfeed for some reason. Often the reason can be linked with something that is going on in your life, like stress from traveling, having visitors, moving home, starting work or leaving the baby for longer periods, etc. or with something in the baby's life, like illness, teething, etc. And sometimes it is difficult to work out exactly why.
Nursing strikes can be frightening and upsetting to both you and your baby, but they are almost always temporary. Most nursing strikes are over, with the baby back to breastfeeding, within a few days.
There is an article called,
My Baby Is Suddenly Refusing to Nurse. Does That Mean It's Time to Wean? at
LLLI | FAQ on Nursing Strikes that you may find useful. I also have a pamphlet called
How to Handle a Nursing Strike which I can post you if you send me a PM with your contact details. There are also some mothers' stories for the LLLI magazine,
New Beginnings, where babies have had nursing strikes at
LLLI | Nursing Strikes.
If you do not think this is the problem and you are really concerned about the flow of your milk then I would recommend that you supplement with a lactation aid rather than a bottle. As giving bottles will encourage the baby to want a fast flow. See the thread
http://www.geobaby.com/forum/thread130351.html
Best wishes,
SARAH