I've also got lots of little white flowers all over the plant. They smell really sweet and perfumey but not at all like methi. The stems are also very tough. My guess is that the leaves should be used when the plant is young, well before the flowering stage. I need to do some research.
I'm growing another two pots of methi so this time I'll try cooking with it at an earlier stage - see if that's better.
Regards
SnS