We recently moved house and my gum got knocked around a little. When moving to our new home I repotted it, however it started to turn brown. I pruned away the dead leaves but now it is just struggling. It is in full sun, I water it every day and give it some liquid fertiliser once a week. Help
Likely, it is being overfertilized and overwatered. The tree's soil will need to dry out down to about 3 inches, very thoroughly, between waterings. Otherwise, roots will suffocate and rot. Add overfeeding to the situation, and you have a brown, crispy plant, unfortunately.
Trees will not feed as heavily as herbaceous plants will. When in doubt, test the soil for deficiencies before feeding.
These articles will help:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm
https://www.gardeningknowhow.com/ornamental/trees/tgen/growing-trees-in-containers.htm
Is dropping heaps of nuts and its driving me crazy cleaning them up all the time. How do I stop it???
This should be done by a professional. Although, you can purchase the hormones and use them on your own, you will be subject to strict laws. Not only that, some of the hormones can be carcinogenic in the amounts that you would be working with them in. Some of them are detrimental to fish, or bee populations, and the process may not work if applied at the incorrect time.
Here are some articles that will help:
https://www.gardeningknowhow.com/ornamental/trees/tgen/fruit-tree-sterilization.htm