Breastfeeding

Ok ladies I am new mom and I'm breastfeeding my 14 week old boy mostly my breast milk and the rest formula because I guess I don't produce enough for one sitting for him I have 2 questions one is I think I might have a clogged milk duct but I'm not sure if I do or not it feels like sharp pain in my boob and it's like sharp pulsing feeling is that what it feels like when you have a clogged milk duct ?? And 2 I'm trying to get my son off the formula i try and try again to produce enough I will finally give him the right amount then he takes alot more later it's like my boobs can't keep up so I have to supply formula after each feed what are some things that help you produce more milk and what does a clogged milk duct feel like?