As you said there is mental and physical suffering.
How do I feel saṅkhāra dukkha, both ways? Is saṅkhāra-dukkha the mental stress e.g. when maintaining the body?
Is dukkha-dukkha also both types, I feel physical pain and suffer also mentally about my sickness?
But dukkha-dukkha can also be stress via vipaka.
I have trouble distinguishing that.