I'm finding it hard to write

Writing used to be a natural process for me. I write when I ache. I write when I'm beaming with happiness. I write in anger. Or i at least used to. The ink on my paper used to change colours based on my emotions. 

Now the flow stopped. There is some block. I can't seem to move it. It's like I'm locked inside a cave. I try to move this gigantic rock that sealed me in. But it wouldn't budge. I sigh and look around, and quiver in the darkness. For such an enclosed space, it is very cold in here. I realise that my breaths are getting heavier and harder to take. 

I can't articulate what I am feeling. I know it, but I can't write about it. Because everytime I try, a tiny ache spreads across my chest and I am scared it will grow wider and just climb onto my heart and also crush my ribcage in the process. 

Writing has always been a medium of releasing the pain out of me. It is like a cold shower on a hot day, it immediately changes the inner temperature. But now, it is not working. Whatever i do, this ache is not leaving my body. 

I hate feeling lifeless like this. I always feel like i light up every room i get into, but recently, I just became so gloomy. It's like I'm possessed by the ghost of melancholy. So any exorcists here who can help me out?