I felt ____ (压力)at the endless homework.

feel(felt)+形容词 表示"感到..".
可以这样造句:
I was under the pressure(stress) at the endless homework.

都可以。

一：pressure n. 压力
1.I felt pressurized at the endless homework.
pressurized/pressurised:形容词：加压的, 受压的
2. I felt （a lot of） pressure at the endless homework.
a lot of pressure 许多的压力，a lot of有无均可。

二：stress，此句中stress为n. 紧张,压力；与pressure的第二种用法相同。 I felt lots of stress. 我感到有压力（紧张）。

feel在此处的2种用法：

feel+ 形容词= 感觉...
I'm feeling good.
I felt good.
It feels soft.

feel+ 名词=感到，感受到...
I felt lots of pressure(stress) from my family.我感受到来自家庭的压力。
I felt pressure(stress) to lose weight.我感受到减肥的压力（痛苦）。

一楼的：I was under the pressure(stress) ...也是非常好的用法。