Hi Jade,
Cancer affects everyone, not just the individual diagnosed with it. My mum had cancer and I ended up caring for her. There are counsellors and support groups that the Cancer Council can provide you further details. I found when I cared for my mum, I became emotionally and mentally drained so it's important for you to look after yourself so you can look after others. I found that having time out like reading, having a massage, talking with others helped me. The Cancer Council also has information on complimentary therapy as well that may be of assistance with fatigue and pain management.
Hope this helps.