It is hard when you are the strong person in the family. It feels alien to acknowledge things may be too much for us, and sometimes even to accept help from others
Grief is a rollercoaster journey. 3 months is really early and the biggest advice I can give is to allow yourself TLC. Sometimes dont have to achieve everything, and its ok to stop for a while.
Getting back into work does help as it provides structure and temporary feeling of normaility. But perhaps you need a couple of weeks off, relieve the pressure on yourself - its ok to slow down for a bit. See how you feel then. Once you have rested you will find it will be easier to return to work
Talking about it with us may help give you an outlet, which may help on your journey
xx