1) There is no evidence that spinal manipulation can treat haemorrhoids and there is no biologically plausible mechanism for improvement.
2) 80% of back pain will improve in 2-4 weeks. Complex conditions can take longer. 10% of simple cases progress beyond 3 months and become chronic.
3) Published guidelines for acute low back pain generally advocate an approach to management that includes advice to: remain active, modify activity, remove only those activities that specifically aggravate and potential replace with other non aggravating activity (relative rest). Good level evidence exists for spinal manipulative therapy and this is advocated in many published guidelines as a treatment approach.
4) Do not return to the chiropractor who made the recommendations. I'd suggest finding another practitioner, regardless of flavour, who will offer a combination approach of manipulative therapy, massage and will then progress to an active approach incorporating exercise therapy and discharge.