Selma Blair admits she feels 'sick as all hell' as she candidly details her ...

Selma Blair is continuing to battle MS with strength and grace.

But that didn't stop the Legally Blonde actress from opening about her bad days in an unvarnished new Instagram shared Friday.

There, along with a candid photo, the 46-year-old talent admitted: 'Here's the truth. I feel sick as all hell.'

The ailing star's hard day was filled with physical and personal obstacles.

Explaining her current condition, Selma revealed: 'I am vomiting and all the things which are not polite to speak of.'

Making matters worse, she continued: 'My son ran away. From me. I have to get him to school.' Her son Arthur is only seven years old.

Adding to her list of woes, Selma said: 'The medical treatments take their toll.'

But the star continued to keep positive, telling followers: 'I am going to get through this. We do.'

'And to moms and dads who watch their kids sick on things we take to get better... I hold you. So glad this is me and not my child. I cannot imagine ever feeling ok again. #roughday. We get through. #realitycheck.'

Famous friends were quick to chime in with support for the Cruel Intentions actress, who continued to share her story in the replies.

Actress Jamie Alexander praised Selma strength, writing: 'Sending you love and healing. I’m so sorry you’re going through this. Grateful you’re strong and wonderful enough to share your experiences with others. So many people are being helped by your willingness to share your reality.'

Blair replied graciously, saying: 'Thank you. I hope. I don’t want to mislead that our challenges are always easy if you just try. Right. Shit can feel bad. Right. Sob . Adore you.'