Health and CervicalCheck campaigner Vicky Phelan says she is not allowing fear over the coronavirus to control her.
But she says sometimes she has to pull herself back from her worries as well.
She told Newstalk Breakfast she has been isolating since the beginning on medical advice.
"I found it quite hard, I stared locking down very early on around the start of March.
"I had a lot of events coming up in March with International Women's Day, so I had to make a decision fairly early on to cancel quite a number of things that I had coming up.
"It was a tough decision to make... but I made it because I could see that this was starting to move already".
"A lot of people in my position - or anyone with an underlying condition who is susceptible to catching anything - was watching this very carefully.
"My oncologist rang me because he could see actually on Twitter that I had a lot of things coming up and really recommended that I pull back".
"Before we locked down here around the 27th of March, and we had schools closing on the 13th, I met a very odd person for a walk or for a coffee.
"But I didn't go anywhere - I had tickets for going to a concert and something else - I didn't go to anything where there was big, public gatherings".
She said she had planned to see her family and parents a lot sooner, until the lockdown was announced.
"I think people might often think that I'm this strong person, but I'm just the same as everybody else.
"I've been very anxious at times over the length of time that we have been locked down.
"And for me like many people in the country who have a terminal illness, you always have it at the back of your mind 'what if I get this thing and what if I end up in hospital - and what if I don't see my parents'.
"You really go to that terrible place where 'what if I die from this and I'm on my own.'
"You have to pull yourself back from it too and not kind of get caught up in it."
She also said she understands people's concerns about going to hospitals.
"The only thing I worry about now more than I would have before is if I get an extra pain or if I'm not feeling well.
"I had a couple of days last week where I was vomiting literally for two days and I started worrying, kind of thinking 'Oh God is this a new tumour, have I got a bowel [obstruction] - it's terrible, your head goes to these awful places.
"But now in lockdown it's a little bit more worrying cause you're thinking - in one respect I know hospitals are open for business... but the worry then is what if it is something serious am I going to see any of my family again?.
"That's why I can understand why people are staying away from Accident and Emergency Departments".