Its up to you ultimately.Well I can drive around it longs the coolant leak fixed it fine as not a great look breaking down middle of cambridge at rush hour to put coolant in. I can adjust my driving to minimalise the problem and get it through the next two years till I can afford something that works
However you cant leave the car in its current state losing coolant and not identifying the cause of the engine juddering. You might cause long term damage and it will cost you more in the long run.