In reply to Heike:
Sorry to hear that. I’m 6 months into a mallet finger injury and no amount of splinting or exercises have helped.
Whilst I’m now pain free, the hope of ever straightening that bit of my finger is long gone.
The fact you’re only 5 weeks in suggests you’ve got to give it way more time.
Sorry not to be more positive, but think you need to be realistic about how long it could potentially take to heal.
Like others have said, try and keep yourself distracted with physical activity you can get away with.
Best of luck.