Belegarth

When I am on the field I am a lefty...I have tried using my right arm and it just doesn't feel right. The only way I can use both arms is if I use 2 swords...how can I strengthen my ability to fight with my right arm?

Use a stress ball to build strenght and force yourself to use your right more often.

Best way is to practice with it. You might try fighting normally 75% of the time, and offhand 25%.

Fighting off-handed single blue vs. single blue for a while first is an easier transition than taking it straight to the field in my experience.

i'm partial to using single blue to develop more control also.

i would reccomend that over all.

also you should try to fight righty with other styles as well so that you know how to beat another lefty if and when you come acrossed one

this is gonna sound wierd but take up juggling. It helps to build up the relationship of your left and right side of your brain. You'll be suprised how much better your cordination after you start juggling regularily for a couple weeks. Also, like it was said earlier, force yourself to use your right more, not just in fighting but in everyday life. Start by eating and brushing your teeth with your right hand and go from there. Hope this helps.
Later

find some extra time if possible, and spar with a newb at first using your right hand.

The reason for fighting a newb is, because A: they probably wont be extremely fast, and B: they probably wont know any particular combos that you would have trouble with right handed.

As you grow in strength and ability with your right hand, they will grow some as well over time, so they will potentially become more challenging to fight.