The great thing about a person with expertise in lactation is that she/he can put your mind at ease about a lot of things. All the things you are mentioning are not unusual. Just remember that even though you cannot pump much out that your baby is the indicator of your milk supply. He is gaining and doing fine so you have plenty of milk. The breast pumps will never actually be able to extract milk like your baby can. In fact, I am on baby #4 and have only succeeded with a pump with one and even then it only lasted about 5 months then I couldn't hardly squeeze a drop out of it.
Also, currently, my baby is 6 months and I have a huge left boob and in my case it is just because my baby and I favor that side so it fills more. In short, this is all normal and you are correct in thinking part of it is related to the fact that your baby has started solids.
If I were you, I wouldn't pay to go see a lactation consultant, I would first call the hospital that you delivered at and ask to have the lactation nurse call you. She will be able to direct you and help you for free. The cool part is, you can call her as many times as you want. If you just do not feel satisfied then you can pay to see a consultant.
Good luck!