Sounds very much like blackfly to me. Everybody seems to be suffering with it this year
![Sad :(](https://chat.allotment-garden.org/Smileys/green/sad.gif)
A spray with soapy water helps. The black and white striped wasps things are probably Hoverflies, the larvae of which feed on blackfly and greenfly, so they are goodies
![happy :)](https://chat.allotment-garden.org/Smileys/green/smile.gif)
Sometimes tomatoes put out new roots from the base of the stem, which appear like white lumps at first.
Photo's would help though
![happy :)](https://chat.allotment-garden.org/Smileys/green/smile.gif)